Mechanical movement for engine-valves.



J. s. SHIELDS & W. LAMB. MECHANICAL MOVEMENT FOR ENGINE VALVES.

- APPLICATION FILED NOV. 7, 1910, I 1905 897. 1 Patented 001. 17, 1911.

wi/lmaooeo w i: 3 imm Q a M T l M\ T 1 a a l 1 1: z T 1 1 1 m rotated a slight opened and closed.

JOHN s. SHI LDS AND WILLIAM LAMB, or DETROIT, MICHIGAN.

MECHANICAL MQVEMENT FOR ENGINE-VALVES;

Specification of Letters Patent.

Patented 0015.17, 1911.

Application filed November 7, 1910. Serial No. 591,109.

, mg to be a full, clear, and exact description of the invention, such as will enable others skilled in the art towhich it appert-ains make and use the same. 7

This invention relates to improvements in mechanical movements for engine valves.-

One ebject'of the, invention is to provide a mechanical movement adapted to be applied to a valve whereby the same will be distance each time it is With the foregoing and other objects in view, the invention co nsists of certain novel features of construction, combination and arrangement ofparts as will be more fully described and particularly pointed out in the appended claim.

In the accompanying drawings: Figure 1 is a side View of a portion of an engine showing the application of the invention for simultaneously operating two valves; Fig. 2 is a vertical sectional view on the line 22 of Fig. 1.

Referring more particularly to the draw ing, 1 denotes a portion of an engine, 2 ,de-

notes two valve casings in which are arranged valve seats 3 with .whlch are enaged valves 4 having stems, 5 which pro ect through and to a considerable distance be 0nd the casings 2 as shown.

evolubly mounted in the engine frame or casing 1 is a valve operating shaft 6 on which is fixedly mounted valve operating cams 7 which are adapted to engage and project valve operating plungers 8 slidably mounted in bosses 9 formed on the frame or casing of the engine as shown. The outer ends of the valve stems 5 terminate a short distance from the outer ends of the plungers 8 and are adapted to be engaged and operated by said plungers to open the valve when said plungers are forced outwardly by the revolving cams 7.

Fixedly secured to the valve stems 5 near their outer ends are valve rotating disks 10 having on their outer sides an annular series of ratchet teeth 11.- The disks 10 also form spaces between which and the outer ends of the valve casings are" arranged 'cams 7 as hereinbefore described.

Secured to the engine frame or casing between the disks 10 is a double spring pawl comprising a fastening plate 13 the outer end of which is forked or bifurcated to form bearing pawls 14: which are arranged at an angle and have their outer end in operative engagement with the ratchet teeth llof the disks 10 whereby when the valves are raised by the cams 7 and the disks thus also elevated the pawls will play loosely over the teeth of the disks 10 and when the valve stems and disks are again forced downwardly .by the pressure of the spring the pawls will operatively engage the teeth 11 of the disks and turn the latter and the valve stems and valves attached thereto to a distance of one tooth, thus revolving the valves and causing the same to seat in a different position each time the same are closed.

While we have herein shown and de-' scribed the valve turning pawl of double form for simultaneously turning two valves, it is obvious that the same may be .con-

.struct'ed in single form and employed with equal advantage for operating or turning a single valve. By operating or turning the valves in the manner described it will be seen that the valves will be caused to wear evenly and thus maintain an absolutely fluid tight en agement with their seats.

From the oregoing description taken in connection with the accompanying drawings, the construction and operation of the invention will be readily understood without requiring a more extended explanation.

Various changes in the form, proportion and the minor details of construction may be resorted to without departing'from the principle or sacrificing any of the advantages of the invention as defined in the apdescribed our invention, what spring pawl intermediately disposed beset our hands in presence of two subscribing twieenl' the valves,1 thedarl'lms ofhwhicl are agwitnesses. gu ar y arrange an ave t eir ree en s a in engagement with the ratchet surfaces of a the disks, whereby said valves are rotated during the longitudinal movement of the Witnesses: valve stems. JAMES RULE,

In testimony whereof we have hereunto ALEXR; CLARK. 

